Anders Logg wrote: > On Tue, Jan 15, 2008 at 08:33:07AM +0100, Murtazo Nazarov wrote: > >>> Related question for both incompressible flow and elasticity >>> problems. Suppose I have a plane of symmetry that will allow me to >>> reduce my computational domain. If >>> >>> \sigma_ij >>> >>> is the relevant stress tensor, then I will have that >>> >>> t^k_i \sigma_ij n_j = 0 >>> >> Ones you have tangential and normal vectors, you can include this as a >> boundary term to the ffc form? >> > > FFC/DOLFIN only have built-in facet normals (FacetNormal). There is no > FacetTangent but it would be easy to add (if we just define what we > mean by the tangents on a face of a tetrahedron). > > The normals and tangents I mean should be on the nodes not on sides of element. This will also be available in UNICORN.
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